US4749965A - Miniaturized gyromagnetic device - Google Patents

Miniaturized gyromagnetic device Download PDF

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Publication number
US4749965A
US4749965A US06/942,839 US94283986A US4749965A US 4749965 A US4749965 A US 4749965A US 94283986 A US94283986 A US 94283986A US 4749965 A US4749965 A US 4749965A
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US
United States
Prior art keywords
wafers
tongues
ferrite
casing
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/942,839
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English (en)
Inventor
Julien Prevot
Kamel Chabani
Michel Courgeon
Denis Duquenoy
Roger Duquenoy
Regis Le Navenec
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Assigned to THOMSON-CSF reassignment THOMSON-CSF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHABANI, KAMEL, COURGEON, MICHEL, DUQUENOY, DENIS, DUQUENOY, ROGER, PREVOT, JULIEN
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Publication of US4749965A publication Critical patent/US4749965A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/38—Circulators
    • H01P1/383—Junction circulators, e.g. Y-circulators
    • H01P1/387—Strip line circulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53261—Means to align and advance work part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53265—Means to assemble electrical device with work-holder for assembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53678—Compressing parts together face to face

Definitions

  • the present invention pertains to a miniaturized and integrated gyromagnetic device and its method of assembly.
  • the gyromagnetic device of the invention is used in the field of ultra-high frequencies ranging from 1 to more than 40 GHz.
  • the term "integrated" implies that this device forms an entire unit which, when completed, can no longer be dismantled except to be destroyed: it therefore, forms a whole which may be considered to be an elementary ultra-high frequency component.
  • Ultra-high frequency devices are undergoing much development, partly because they are being increasingly used in all fields (such as telecommunications, radar, satellites, etc.) where electrical signals are transmitted in the form of waves within or beyond the atmosphere, and also because they have forms which are easier to use than tubes and metallic waveguides.
  • Ultra-high frequency sources are currently semi-conducting chips (at least for small power values) and the waveguides are microstrips. This means that it is possible to manufacture circuits which may be hybrid or integrated but will be compact in all cases.
  • the gyromagnetic device according to the invention has been designed for easy assembly according to a simple and, therefore, swift and inexpensive method.
  • one object of the invention is to have a miniaturized, ultra-high frequency component because the design of such a component eliminates all mechanical means such as screws for assembly: being miniaturized, it can be integrated into a hybrid circuit.
  • Another object of the invention is to provide for means designed to absorb thermal expansion during the operation of the device. When these compensation means are not provided for, the ferrite elements can break.
  • the gyromagnetic device comprises conventional parts: a conducting core fitted with external connectors, at least one ferrite element and one absorbing block, at least one magnet and an internal ground, the entire unit being mounted in a casing.
  • the parts which must be assembled and positioned with precision (especially the core and the ferrite elements) form a whole clamped between two internal ground parts fitted with reciprocal fixing means, the external or internal shapes of these different parts being complementary to one another, thus providing for precise positioning.
  • the invention also comprises the magnet positioning part which is a pressure washer that is not flat, the elasticity of which absorbs thermal expansions.
  • the method for assembling the gyromagnetic device according to the invention comprises a simple stacking of parts, the external and internal shapes of which automatically enable them to be correctly positioned.
  • the invention pertains to a miniaturized and integrated gyromagnetic device comprising, within a casing closed by a base plate, one conducting core, two ferrite wafers, one internal ground and one magnet, a gyromagnetic device wherein the conducting core and the two ferrite wafers are held so that they are integrally joined to each other and precisely positioned by two internal ground plates, made of non-magnetic material, one of these plates having tongues which fit into the slits formed in the other plate, providing for reciprocal fastening to clamp the core and the ferrite wafers.
  • FIG. 1 is an exploded view of a gyromagnetic device according to the prior art
  • FIG. 2 is an exploded view of a gyromagnetic device according to the invention
  • FIG. 3 is a cross-section of a gyromagnetic device according to the invention
  • FIG. 4 is a three-quarter view of a gyromagnetic device according to the invention.
  • FIG. 5 is a three-quarter view of the two internal ground elements.
  • FIG. 6 is a plane view of the element out of which the core is cut.
  • FIG. 7 is a three-dimensional view of the dummy for pre-assembling parts which have to be positioned with precision.
  • FIG. 8 is a three-dimensional view of the tools used to close the gyromagnetic device of the invention by electric welding.
  • FIG. 1 gives an exploded view of an isolator according to the prior art.
  • An isolator comprises a core 1.
  • This core is a metallic part shaped like a star with three arms at 120°, held between two wafer-shaped ferrite parts 2 and 3.
  • Two arms of the core 1 end in coaxial connectors 4 and 5 which constitute the isolator's external connectors and the third arm is linked to an absorbing block 6, which is a resistor, one end of which is grounded.
  • the unit formed by the metallic core 1 and the two ferrite wafers 2 and 3 is clamped between two parts 7 and 9 forming a ground plane. The thickness of these two parts 7 and 9 is sufficient for two magnets 8 and 10 to be housed in them.
  • the thickness of the two parts 7 and 9 forming the ground plane is such that they can be used as a protective casing for the isolator, the coaxial external connectors 4 and 5 and the connector base plate 6 which contain the absorbing block being then used as a means of fixing the two base plates to each other by means of the fixing screws of the coaxial connectors.
  • the casing is completed by steel plates 11 which are bonded to all the surfaces where there is no coaxial connector base plate: these steel plates 11 are used firstly, to make the device relatively impervious in order to keep out any dust when might create a short circuit and, secondly, to form a magnetic shield around the isolator.
  • Modes of embodiment of an isolator other than the one depicted in FIG. 1, exist and are known: however, as a general rule, the various constituent elements, and especially the core and ferrite wafers, are first joined to one another by means of a bonding coat: this joining is a very difficult operation since the parts of an isolator having to be assembled with a positioning precision of about 1/100th mm.
  • An isolator according to the invention comprises a metallic conducting core 12 which is held between two ferrite wafers 13 and 14. These ferrite wafers are themselves integrally joined to the absorbing blocks 15 and 16 and to the dielectrics 13a and 14a.
  • the external shape of the dielectric wafers 13a and 14a corresponds to an isosceles triangle, each vertex of which is truncated: the positioning of two truncated vertices corresponds to the outputs of the isolator according to the invention, through metallic strips, and the third truncated vertex corresponds to the arm of the core 12 which conducts ultra-high frequency power towards the absorbing blocks 15 and 16.
  • the wafer 13a finds a place between three lugs 22 of the lower ground 17, then the core 12 is superimposed on the wafer 13a and the wafer 14a takes its place between the three lugs 22 of the lower ground: on this stack is laid the upper ground plate 18 which has three holes 23, the shape and position of which are suited to enable the tongues 23 to go through them.
  • the stacking it is enough to twist and fold back the tongues 22 to make a precisely pre-positioned assembly.
  • the two internal ground plates 17 and 18 are also triangular shaped, with truncated vertices, this triangular shape corresponding to the triangular shape of the wafers 13a and 14a, the entire assembly being machined and fitted with a precision of about 1/100th mm.
  • the isolator according to the invention comprises a magnet 19 which is held in position by means of a washer 20 in the casing 21 of the device.
  • This casing 21 is closed, when the assembly is completed, by means of a plate 21a, the parts 21 and 21a being made of steel.
  • the washer 20 is a pressure washer and is therefore made of steel, bronze or beryllium, and comprises means 23 to hold and center the magnet 19, these means being folded on one side of the main plane of the washer 20, and means 24 giving it elasticity with which to compensate for thermal expansion or to absorb expansion when the isolator is closed by electrical welding, these means 24 being made up of tongues folded on another side of the main plane of the washer 20.
  • the conducting metal core 12 comprises two arms 25 and 26 providing external connections to the isolator. These two arms are made up of microstrips.
  • the core also comprises an arm 27 which, inside the completed device, is located between the two absorbing blocks 15 and 16.
  • the core is handled in the form of a frame 28 into which the core as such is cut by chemical means. This frame 28 is used to center the core in relation to the ferrite wafers.
  • FIG. 3 depicts a cross-section view of an isolator according to the invention when the parts of FIG. 2 are assembled and compressed.
  • the FIG. 3 is only inverted with respect to FIG. 2, i.e. it lies on its base plate 21a, as is normal, while FIG. 2 corresponds to the stacking of parts in the casing 21, i.e. when an isolator is being made.
  • FIG. 4 represents a three-quarter view of a finished isolator: by way of example, while the isolator of the prior art in FIG. 1 is an object approximately three centimetres square with a thickness of one and a half centimetres, with access provided by coaxial connectors, the isolator according to the invention is an object which is substantially cubical in shape, about 6 mm. on each side, incapable of being dismantled because it is electrically welded, provided with a base plate 21a which is just big enough to be screwed or bonded to a hybrid circuit. The small dimensions make it possible to connect microstrips 25 and 26 to an external circuit without having to use coaxial connectors.
  • FIG. 5 depicts a three-quarter view of the two internal ground parts 17 and 18.
  • these two parts are made of a material such as copper or brass, and both of them are broadly shaped like isosceles triangles, the vertices of which are truncated.
  • one of these two parts, the part 17 for example is fitted with tongues 22 which are cut out of the same plate as the part 17, these tongues being folded at right angles and one of them being longer than the others so that the unit can be handled with forceps.
  • the other internal ground part, the part 18, is provided with slit-shaped holes 23, the position and dimensions of which correspond to the tongues 22.
  • the core 12 and the ferrite parts 13 and 14 as well as the absorbing blocks 15 and 16 are positioned between the two internal ground parts 17 and 18, it is enough to lower the part 18 by making it slide along the longest of the tongues 22 to form a sandwich of parts, and then to fold the tongues 22 to form a compact and easily handled unit.
  • the dimensions of the parts 17 and 18 are calculated so that the dielectric parts 13a and 14a, which are stacked between the tongues, are positioned to a precision of within the nearest hundredth of a millimetre.
  • FIG. 6 represents a plane view of the frame 28 into which the core 12 is cut.
  • This frame 28 which is manufactured in batches, by a chemical cutting-out process, has the specific feature of comprising an internal cut-out, surrounding the core 12 with its arms 25, 25 and 27, the edges 29 of this cut-out corresponding to the external shape of the casing 21 of the isolator according to the invention.
  • the dielectric parts 13a and 14a are centered by means of their external edges with respect to the ground plane parts 17 and 18, the conducting core 12 is, for its part, centered by means of the internal edge of its frame with respect to the external edge of the casing.
  • FIG. 7 depicts a three-dimensional view of the dummy for the pre-assembling of the parts which have to be positioned: this figure will make it easier to understand the operations of the method for assembling the isolator according to the invention, as well as the centering of the core 12 and the role played by the metallic frame 28 in this centering.
  • a dummy 30 is used with the same external contour 31 as the casing 21 of the device. Inside its volume, this dummy 30 has an extractor 32 which goes through the socket of a mounting tool 33. In the example of FIG. 7, the extractor 32 is depicted in the top position only so that it can be seen.
  • the method for assembling a gyromagnetic device according to the invention consists in stacking the parts in the following order on the mounting tool of FIG. 7, the extractor 32 being in the bottom position:
  • the core 12 supported by its metallic plate 28,
  • the triangular shaped parts with truncated vertices are automatically stacked inside the dummy 30: it can therefore be said that they are centered with respect to one another through their external contour.
  • the core 12 which does not have a triangular shape is centered on the external contour 31 of the dummy 30 by means of the internal contour 29 of the cut-out in the frame 28.
  • This compact, homogeneous and pre-positioned unit is extracted from the mounting dummy 30 and is brought as an entire piece into the assembly of the gyromagnetic circuit according to the invention.
  • This assembling operation consists in laying the following parts within the casing 21:
  • the washer 20 to compensate for thermal expansion and the magnet 19 which is maintained by the lugs 23 of the washer 20,
  • the steel plate 21a which forms the base plate for fastening the insulator.
  • FIG. 8 illustrates this electric welding operation.
  • a socket 35 of the electric welding tool has a first housing 36 in which the casing 21 of the isolator is precisely positioned, and a second housing 37 which is used to position, also precisely, the base plate 21a with respect to the casing.
  • the assembly is pressed between two electrodes, between there flows an electric current which finally closes the gyromagnetic device by welding the base plate 21a to the casing 21.
  • This welding is done in keeping with the positioning dimensions, in particular by means of a metallic ridge, supported by the casing 21, which bites into the base plate 21a.
  • the expansion-compensating washer is compressed to a pre-determined size in such a way that the internal components are subjected to constant pressure.
  • the frame 28 is cut so as to be flush with the microstrips 25 and 26. To make the FIG. 8 clearer, the frame 28 is not depicted in it.
  • the device according to the invention is used essentially in ultra-high frequency equipment, especially radars and telecommunications systems.

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US06/942,839 1985-12-20 1986-12-17 Miniaturized gyromagnetic device Expired - Fee Related US4749965A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518986A FR2592231B1 (fr) 1985-12-20 1985-12-20 Dispositif gyromagnetique miniature et procede d'assemblage de ce dispositif.
FR8518986 1985-12-20

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US07/160,019 Division US4868971A (en) 1985-12-20 1988-02-24 Method for assembling a miniaturized gyromagnetic device

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US06/942,839 Expired - Fee Related US4749965A (en) 1985-12-20 1986-12-17 Miniaturized gyromagnetic device
US07/160,019 Expired - Fee Related US4868971A (en) 1985-12-20 1988-02-24 Method for assembling a miniaturized gyromagnetic device

Family Applications After (1)

Application Number Title Priority Date Filing Date
US07/160,019 Expired - Fee Related US4868971A (en) 1985-12-20 1988-02-24 Method for assembling a miniaturized gyromagnetic device

Country Status (6)

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US (2) US4749965A (ja)
EP (1) EP0230819A1 (ja)
JP (1) JPS62247605A (ja)
FR (1) FR2592231B1 (ja)
IE (1) IE863320L (ja)
NO (1) NO865095L (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172080A (en) * 1991-06-28 1992-12-15 Radio Frequency Systems, Inc. Garnet centering ring for circulators and isolators
US5384556A (en) * 1993-09-30 1995-01-24 Raytheon Company Microwave circulator apparatus and method
EP0829916A2 (de) * 1996-09-11 1998-03-18 Philips Patentverwaltung GmbH Mikrowellen-Bauelement
US6107895A (en) * 1996-04-03 2000-08-22 Deltec Telesystems International Limited Circulator and components thereof
GB2354885A (en) * 1996-12-09 2001-04-04 Racal Mesl Ltd Microwave circulators and isolators
US20020158703A1 (en) * 2001-02-16 2002-10-31 Murata Manufacturing Co., Ltd. Nonreciprocal circuit device and communication apparatus using same
US6625869B2 (en) * 2000-05-30 2003-09-30 Murata Manufacturing Co., Ltd. Method for manufacturing nonreciprocal circuit device
US20100117754A1 (en) * 2007-04-17 2010-05-13 Hitachi Metals, Ltd. Non-reciprocal circuit device
RU170581U1 (ru) * 2016-12-06 2017-04-28 федеральное государственное бюджетное образовательное учреждение высшего образования "Новгородский государственный университет имени Ярослава Мудрого" Магнитоэлектрический гиратор

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4973142A (en) * 1981-08-20 1990-11-27 E. I. Du Pont De Nemours And Company Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole
JP2803517B2 (ja) * 1993-02-26 1998-09-24 株式会社村田製作所 電子部品の組立方法および組立装置
DE19634952A1 (de) * 1996-08-29 1998-03-05 Philips Patentverwaltung Mikrowellen-Bauelement
EP0859424A3 (en) * 1997-02-18 2000-03-22 The Whitaker Corporation Surface mount technology contact for ferrite isolator/circulator applications
JP4795195B2 (ja) * 2006-10-17 2011-10-19 三井金属アクト株式会社 ラッチ装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414843A (en) * 1965-10-24 1968-12-03 Motorola Inc Four-part microwave ferrite circulator
US3510804A (en) * 1968-05-29 1970-05-05 Tdk Electronics Co Ltd Lumped parameter circulator and its construction
US3621476A (en) * 1969-10-02 1971-11-16 Tdk Electronics Co Ltd Circulator having heat dissipating plate
US3739302A (en) * 1971-06-01 1973-06-12 Trak Microwave Corp Miniaturized ferrimagnetic circulator for microwaves
US4209756A (en) * 1976-11-02 1980-06-24 Nippon Electric Co., Ltd. Circulator comprising a spring member between a ferrimagnetic piece and an adjacent conductor
JPS55123220A (en) * 1979-03-15 1980-09-22 Hitachi Metals Ltd Lumped constant type circulator and isolator
US4246552A (en) * 1978-02-03 1981-01-20 Oki Electric Industry Co., Ltd. Stripline circulator wherein each inner conductor is V-shaped
US4276522A (en) * 1979-12-17 1981-06-30 General Dynamics Circulator in a stripline microwave transmission line circuit
JPS5763914A (en) * 1980-10-04 1982-04-17 Hitachi Metals Ltd Lumped constant type circulator and isolator

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Publication number Priority date Publication date Assignee Title
US3787958A (en) * 1965-08-18 1974-01-29 Atomic Energy Commission Thermo-electric modular structure and method of making same
JPS63914A (ja) * 1986-06-17 1988-01-05 三菱電機株式会社 機械的インタ−ロツク装置
JPH01232220A (ja) * 1988-03-12 1989-09-18 Fuji Seiki Kk 米飯惣菜等の計量装置
JP3321028B2 (ja) * 1997-06-10 2002-09-03 旭光学工業株式会社 内視鏡用光源装置の送気ポンプ支持構造

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414843A (en) * 1965-10-24 1968-12-03 Motorola Inc Four-part microwave ferrite circulator
US3510804A (en) * 1968-05-29 1970-05-05 Tdk Electronics Co Ltd Lumped parameter circulator and its construction
US3621476A (en) * 1969-10-02 1971-11-16 Tdk Electronics Co Ltd Circulator having heat dissipating plate
US3739302A (en) * 1971-06-01 1973-06-12 Trak Microwave Corp Miniaturized ferrimagnetic circulator for microwaves
US4209756A (en) * 1976-11-02 1980-06-24 Nippon Electric Co., Ltd. Circulator comprising a spring member between a ferrimagnetic piece and an adjacent conductor
US4246552A (en) * 1978-02-03 1981-01-20 Oki Electric Industry Co., Ltd. Stripline circulator wherein each inner conductor is V-shaped
JPS55123220A (en) * 1979-03-15 1980-09-22 Hitachi Metals Ltd Lumped constant type circulator and isolator
US4276522A (en) * 1979-12-17 1981-06-30 General Dynamics Circulator in a stripline microwave transmission line circuit
JPS5763914A (en) * 1980-10-04 1982-04-17 Hitachi Metals Ltd Lumped constant type circulator and isolator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172080A (en) * 1991-06-28 1992-12-15 Radio Frequency Systems, Inc. Garnet centering ring for circulators and isolators
US5384556A (en) * 1993-09-30 1995-01-24 Raytheon Company Microwave circulator apparatus and method
US6317010B1 (en) 1996-04-03 2001-11-13 Deltec Telesystems International Limited Thermostable circulator with the magnetic characteristics of the ferrite and magnet correlated
US6107895A (en) * 1996-04-03 2000-08-22 Deltec Telesystems International Limited Circulator and components thereof
EP0829916A2 (de) * 1996-09-11 1998-03-18 Philips Patentverwaltung GmbH Mikrowellen-Bauelement
US6005451A (en) * 1996-09-11 1999-12-21 U.S. Philips Corporation Microwave element
EP0829916A3 (de) * 1996-09-11 2000-05-03 Philips Patentverwaltung GmbH Mikrowellen-Bauelement
GB2354885A (en) * 1996-12-09 2001-04-04 Racal Mesl Ltd Microwave circulators and isolators
GB2354885B (en) * 1996-12-09 2001-06-20 Racal Mesl Ltd Microwave circulators and isolators
US6625869B2 (en) * 2000-05-30 2003-09-30 Murata Manufacturing Co., Ltd. Method for manufacturing nonreciprocal circuit device
US20020158703A1 (en) * 2001-02-16 2002-10-31 Murata Manufacturing Co., Ltd. Nonreciprocal circuit device and communication apparatus using same
US6828870B2 (en) * 2001-02-16 2004-12-07 Murata Manufacturing Co., Ltd. Nonreciprocal circuit device having a casing comprising two members of different thicknesses
US20100117754A1 (en) * 2007-04-17 2010-05-13 Hitachi Metals, Ltd. Non-reciprocal circuit device
US8134422B2 (en) 2007-04-17 2012-03-13 Hitachi Metals, Ltd. Non-reciprocal circuit device
RU170581U1 (ru) * 2016-12-06 2017-04-28 федеральное государственное бюджетное образовательное учреждение высшего образования "Новгородский государственный университет имени Ярослава Мудрого" Магнитоэлектрический гиратор

Also Published As

Publication number Publication date
IE863320L (en) 1987-06-20
NO865095L (no) 1987-06-22
NO865095D0 (no) 1986-12-16
FR2592231A1 (fr) 1987-06-26
FR2592231B1 (fr) 1988-07-08
US4868971A (en) 1989-09-26
EP0230819A1 (fr) 1987-08-05
JPS62247605A (ja) 1987-10-28

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